iqon Posted February 9, 2015 Share Posted February 9, 2015 Plan asks to fit T nuts to undercarriage legs and fit undercarriage under the ply plate, is there and pros and cons in doing it this way. Quote Link to comment Share on other sites More sharing options...
Stevo Posted February 9, 2015 Share Posted February 9, 2015 ...on a what? Quote Link to comment Share on other sites More sharing options...
iqon Posted February 9, 2015 Author Share Posted February 9, 2015 On a pattern plane....... Quote Link to comment Share on other sites More sharing options...
Richard Wood Posted February 10, 2015 Share Posted February 10, 2015 Confused, can you give a bit more info? Usual method is to fix captive nuts into ply plate in fuselage & secure u/c with M5 or M6 nylon bolts. Quote Link to comment Share on other sites More sharing options...
Andy Green Posted February 10, 2015 Share Posted February 10, 2015 Sounds like the ply plate act as one big clamp, I use saddle clamps without any problems. Andy Quote Link to comment Share on other sites More sharing options...
Bob Cotsford Posted February 10, 2015 Share Posted February 10, 2015 so are the screw heads accessed from inside the model and is a fairing fitted below the u/c to merge it into the fuselage? The only reason I can think of would be to allow an invisible fixing with no access holes on the outside. I can't see any major cons to it - as long as the captive nuts are really secure. Quote Link to comment Share on other sites More sharing options...
Richard Wood Posted February 10, 2015 Share Posted February 10, 2015 & please don't use metal bolts. Seen one or two fuselages badly damaged from u/c being ripped out in a heavy landing. The nylon bolts will stand up to normal landing loads but will shear in a heavy crunch, saving fuselage from damage. Quote Link to comment Share on other sites More sharing options...
iqon Posted February 10, 2015 Author Share Posted February 10, 2015 My conclusion is that it must be done to save weight, dont need as much ply...... Quote Link to comment Share on other sites More sharing options...
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